I am wondering were people have locally sourced their stainless steel, looking to build the 3/4" version. I have found it online, but none of the bigbox hardware stores stock it locally. Thanks!
You want 3/4ā EMT electrical conduit, which is so called by its inside diameter.
Blaine is right if you want 3/4" you need EMT.
Now if you want Stainless Steel you need 1"ā¦I got mine from Metal Depot reasonable price and fast shipping.
Welcome to the āwonderfulā world of round, hollow lengths of steel (RHLoS)! Sometimes, they are described based on ID (inner diameter), and sometimes, itās based on OD (outer diameter).
In general, RHLoS that are āsupposedā to have things travelling through them (such as pipes and conduits) are measured by ID, so you know how much crap you can shove through them. RHLoS that are āsupposedā to be structural (such as support tubes, furniture legs, etc.) are measured by OD, since thatās the most important information for the architect/designer (although the structural/mechanical engineer will surely want to know the wall thickness or the ID as well).
So, the 3/4" EMT conduit, āCā, version is based on a 3/4" ID with a reasonably standardized OD (23.5mm). The 25mm, āFā, version is OD for basically everyone outside the US who is using a rational measuring system. Which leaves the 25.4mm, āJā, version for 1" OD SS.
āCā - Conduit (3/4" ID EMT steel conduit)
āFā - Foreign (25mm OD SS tubing)
āJā - Jumbo (1" OD SS tubing)
edit: Yes, the .4mm difference between the F and J matters, much less the 1.5mm between the C and F.
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I was looking for this exact info. I ended up getting the 3/4" EMT tubing, but they had black steel tubing that I considered as well.
That black ātubingā is actually āpipeā, and the EMT tubing is incorrectly named ātubingā by engineers way smarter than me. 
Tubing= O.D.
Pipe = I.D.
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Or more commonly EMT conduit.
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I have been educated on the matters of Pipe, Tubing and Conduitā¦till i screw it up again.
Honestly didnāt know the difference between Pipe and Tubing. Now i do, thank you.
I knew it was conduit but didnāt think to call it that since I bought eight 5ā ones because I am bad a math.
Thanks for all the reply, yes I was confused, didnāt know there was so much to learn about pipes, tubes inside outside measurements! 3/4" electrical conduit it is then!
Iām to deep in to printing the parts for the 3/4" to start over and print the 1 inch. Iām printing my parts out of nylon 910 and cf petg, expensive reprint!
LOL that is funny! I guess I can relay to that chart even though Iām not canadianā¦
That chart is 100% accurate, except if itās a long distance that isnāt work related itās measured in hours. 
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If it shrinks and is as flexible as what iāve read, nylon might not be the best choice for this. Iāve never tried it so I canāt honestly comment. PLA works great and is so much cheaper.
Well, the T in EMT stands for Tube soā¦
^ Thatās exactly my point. If 3/4ā EMT doesnāt measure 3/4ā o.d., it should be labeled 3/4ā EMP.
It was named by Electricians? Maybe it stands for thin? Yes thing is closer but non plumbers really
Thing?
nylon 910 is not your typical nylon, I donāt use pla for anything structural, its too brittle, I use material that will hold up long term.
PLA works great. Feel free to make it your own, but the parts were designed with PLA in mind.